Yup this definitely sounds like cable tension to me too. After you attached it and ran through the gears you got some stretch and cable housing settling, and now there isn’t enough tension. When I worked as a mechanic I would always install, run the gears a few times and intentionally try and get up into the gears it couldn’t, then head back down to the 11t, undo the cable and re-install it before I even touched the barrel adjuster. A good place to start with the barrel adjuster is one that lets you turn either way right from the start, not just out. Good luck!
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